I finally had time to look into the problem I was having with getting a listing of Mapper. When I tried to list Mapper on the printer the first line printed at 80 columns and the rest tried to print at 40 columns.
I looked into the setup of ZBasic and double checked the printer, which only consisted of telling it which port (1) the printer was on. That apparently wasn’t the problem. I went back to the listing and noticed the change was right after the end of the first line. After loading the program into the editor, I went to the beginning of the second line and deleted backwards until the last character of the first line and put a new end of line in.
Exiting the editor, I tried listing Mapper again on the printer. It looks like there was an invisible character changing things and that took care of it. Everything came out fine, seven pages. At this point the source is up to 17 blocks.
I’ve updated the disk image that is available.

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